(self)
| 1117 | |
| 1118 | @unittest.expectedFailure # TODO: RUSTPYTHON |
| 1119 | def test_islice(self): |
| 1120 | for args in [ # islice(args) should agree with range(args) |
| 1121 | (10, 20, 3), |
| 1122 | (10, 3, 20), |
| 1123 | (10, 20), |
| 1124 | (10, 10), |
| 1125 | (10, 3), |
| 1126 | (20,) |
| 1127 | ]: |
| 1128 | self.assertEqual(list(islice(range(100), *args)), |
| 1129 | list(range(*args))) |
| 1130 | |
| 1131 | for args, tgtargs in [ # Stop when seqn is exhausted |
| 1132 | ((10, 110, 3), ((10, 100, 3))), |
| 1133 | ((10, 110), ((10, 100))), |
| 1134 | ((110,), (100,)) |
| 1135 | ]: |
| 1136 | self.assertEqual(list(islice(range(100), *args)), |
| 1137 | list(range(*tgtargs))) |
| 1138 | |
| 1139 | # Test stop=None |
| 1140 | self.assertEqual(list(islice(range(10), None)), list(range(10))) |
| 1141 | self.assertEqual(list(islice(range(10), None, None)), list(range(10))) |
| 1142 | self.assertEqual(list(islice(range(10), None, None, None)), list(range(10))) |
| 1143 | self.assertEqual(list(islice(range(10), 2, None)), list(range(2, 10))) |
| 1144 | self.assertEqual(list(islice(range(10), 1, None, 2)), list(range(1, 10, 2))) |
| 1145 | |
| 1146 | # Test number of items consumed SF #1171417 |
| 1147 | it = iter(range(10)) |
| 1148 | self.assertEqual(list(islice(it, 3)), list(range(3))) |
| 1149 | self.assertEqual(list(it), list(range(3, 10))) |
| 1150 | |
| 1151 | it = iter(range(10)) |
| 1152 | self.assertEqual(list(islice(it, 3, 3)), []) |
| 1153 | self.assertEqual(list(it), list(range(3, 10))) |
| 1154 | |
| 1155 | # Test invalid arguments |
| 1156 | ra = range(10) |
| 1157 | self.assertRaises(TypeError, islice, ra) |
| 1158 | self.assertRaises(TypeError, islice, ra, 1, 2, 3, 4) |
| 1159 | self.assertRaises(ValueError, islice, ra, -5, 10, 1) |
| 1160 | self.assertRaises(ValueError, islice, ra, 1, -5, -1) |
| 1161 | self.assertRaises(ValueError, islice, ra, 1, 10, -1) |
| 1162 | self.assertRaises(ValueError, islice, ra, 1, 10, 0) |
| 1163 | self.assertRaises(ValueError, islice, ra, 'a') |
| 1164 | self.assertRaises(ValueError, islice, ra, 'a', 1) |
| 1165 | self.assertRaises(ValueError, islice, ra, 1, 'a') |
| 1166 | self.assertRaises(ValueError, islice, ra, 'a', 1, 1) |
| 1167 | self.assertRaises(ValueError, islice, ra, 1, 'a', 1) |
| 1168 | self.assertEqual(len(list(islice(count(), 1, 10, maxsize))), 1) |
| 1169 | |
| 1170 | # Issue #10323: Less islice in a predictable state |
| 1171 | c = count() |
| 1172 | self.assertEqual(list(islice(c, 1, 3, 50)), [1]) |
| 1173 | self.assertEqual(next(c), 3) |
| 1174 | |
| 1175 | # Issue #21321: check source iterator is not referenced |
| 1176 | # from islice() after the latter has been exhausted |
nothing calls this directly
no test coverage detected